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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> �lllll� Analytical 819 Striker Avcnue Scute 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EA Engineering Science&Tech Client Prol ID Exxon 7-0137, 51501 37 1300 Sampled 01/14/98 <br /> 468 Mt Diablo Blvd Ste 8100 Sample Descript Trip Blank Received 01/15/98 - <br /> Ufayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 01/26/98 <br /> Attention Chnsta Marting Lab Number 9801803-09 Reported 01J301.94 <br /> IC Batch Number GC012698BTEX06A <br /> strument ID GCHP06 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> tnalyte Detection Limit Sample Results <br /> ug/L ug/L <br /> IrPPH as Gas 50 N D <br /> Elethyl t-Butyl Ether 25 N D <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> thyl Benzene 0 50 N D <br /> ylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> surrogates Control Limits % % Recovery <br /> rifluorotoluene 70 130 98 <br /> analytes reported as N D were not present above the stated ILMA of detection <br /> tOU01A ANALYTICAL - ELAP 41210 <br /> rd Herling <br /> ect Manager Page 9 <br />